The opening “Half Lesson” is titled: Your Brain Is Not for Thinking. It’s not? No. Your brain’s most important job is predicting your body’s energy needs before they arise so you can efficiently make worthwhile movements and survive to pass your genes to the next generation.

This short, accessible, frequently amusing and deeply subversive book exploded pretty much everything I’ve understood about the brain and how it works. That’s quite a statement given I’m a psychiatrist—my medical specialty is the brain.

For example, memories are not filed like paperwork—that’s a metaphor. They are actually recreated on demand. What! Yes.